Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An anomaly of the eye, usually a developmental defect, that often results in some loss of vision.
from The Century Dictionary.
- noun In medicine: The part taken away in mutilation; a mutilation; a defect.
- noun A defect in the iris, choroid, retina, optic nerve, or lens, due to incomplete or perverted closing of the choroidal fissure: also used for other fissures in the eye or its lids.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Anat. & Med.) A defect or malformation; esp., a fissure of the iris supposed to be a persistent embryonic cleft.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An abnormal
hole present frombirth in one of the structures of theeye , such as thelens ,eyelid , orretina .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Again, the iris may be the seat of a malformation, termed coloboma, which consists in a deficiency or cleft, clearly due in a great number of cases to an arrest in development.
X. The Organs of the Senses and the Common Integument. 1c. 1. The Tunics of the Eye 1918
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Sometimes the choroidal fissure persists, and when this occurs the choroid and iris in the region of the fissure remain undeveloped, giving rise to the condition known as coloboma of the choroid or iris.
X. The Organs of the Senses and the Common Integument. 1c. The Organ of Sight 1918
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Loper, because of a hereditary disease, coloboma, was born blind in her right eye.
USATODAY.com - Teen sharpshooter hits with single vision 2004
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Thomas Henderson maintains that the results of iridectomy are beneficial because the raw edges of the coloboma, which do not cicatrize, permit access of the aqueous to the iris veins, and that myotics, inasmuch as they contract the pupil, open the iris crypts and therefore act, less efficiently, perhaps, but act none the less like an iridectomy.
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Posey 6.178 had a case of coloboma in the macular region in a patient who had a supernumerary tooth.
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In three generations twelve members of one family had either coloboma iridis or irideremia.
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Posey had a case of coloboma in the macular region in a patient who had a supernumerary tooth.
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Apparently if one's pupil is irregularly shaped it could be due to simply just a genetic variation (which is normal) or more serious things such as iritis, multiple sclerosis, coloboma, previous cataract surgery, and/or neurosyphilis.
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6.177 In three generations twelve members of one family had either coloboma iridis or irideremia.
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"hey, my son is 7yrs old and he has bilateral coloboma. i first noticed when he was about 3 weeks ..."
Scientific Blogging 2009
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